期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 579, 期 -, 页码 607-618出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.06.086
关键词
CoS2 nanosheets; NiFe layered double hydroxides nanospheres; Supercapacitor
资金
- Qingdao Innovation Leading Talent Program, Taishan Scholars Program
- Shandong Provincial Natural Science Foundation [ZR2018BEM020]
Layered double hydroxides (LDHs) are a kind of classic pseudocapacitive materials with lamellar structure and large specific surface area, which have attracted swinging attention in the electrochemical energy storage area. The CoS2@Ni is synthesized through a hydrothermal process, followed by surface generation of the flower-like nickel-iron layered double hydroxide (NiFe-LDH) nanospheres through a hydrothermal process, which is directly used to design a binder-free electrode with a splendid capacitance capability. The as-synthesized NiFe-LDH@CoS2@Ni electrode presents an outstanding specific capacitance of 11.28 F cm(-2) (3880 F g(-1)) at 2 mA cm(-2) (1.17 A g(-1)) in a three electrodes system. Also, the all-solid-state asymmetric supercapacitor (ASC) is combined utilizing the NiFe-LDH@CoS2@Ni hybrid as the positive electrodes and active carbon covered Ni foam as negative electrodes, respectively. The as-fabricated ASC exhibits a high energy density of 15.84 Wh kg(-1) at the power density of 375.16 W kg(-1) and can be able to lighten a blue LED indicator for more than 30 min, revealing that the prepared NiFe-LDH@CoS2@Ni owns great potential in the aspect of practical applications. Therefore, the prepared NiFe-LDH@CoS2@Ni with outstanding electrochemical properties could be applied for high-performance supercapacitors. (C) 2020 Elsevier Inc. All rights reserved.
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